Add support for (de)serializing cc::Layer properties.

cc/layers/layer_unittest.cc

Index: cc/layers/layer_unittest.cc
diff --git a/cc/layers/layer_unittest.cc b/cc/layers/layer_unittest.cc
index 12aa514fee68d60fb1934eca34e53cd16c9e5bc5..8117de8296e13422ba91b24c19e85bbdc427d1e9 100644
--- a/cc/layers/layer_unittest.cc
+++ b/cc/layers/layer_unittest.cc
@@ -1567,5 +1567,140 @@ TEST_F(LayerTest, DeleteMaskAndReplicaLayer) {
   EXPECT_EQ(nullptr, layer_dest_root->replica_layer());
 }
 
+TEST_F(LayerTest, SimplePropertiesSerialization) {
+  /* Testing serialization of properties for a tree that looks like this:
+          root+
+          /  \
+         a*   b*+[mask:*,replica]
+        /      \
+       c        d*
+     Layers marked with * have changed properties.
+     Layers marked with + have descendants with changed properties.
+     Layer b also has a mask layer and a replica layer.
+  */
+  scoped_refptr<Layer> layer_src_root = Layer::Create(LayerSettings());
+  scoped_refptr<Layer> layer_src_a = Layer::Create(LayerSettings());
+  scoped_refptr<Layer> layer_src_b = Layer::Create(LayerSettings());
+  scoped_refptr<Layer> layer_src_b_mask = Layer::Create(LayerSettings());
+  scoped_refptr<Layer> layer_src_b_replica = Layer::Create(LayerSettings());
+  scoped_refptr<Layer> layer_src_c = Layer::Create(LayerSettings());
+  scoped_refptr<Layer> layer_src_d = Layer::Create(LayerSettings());
+  layer_src_root->AddChild(layer_src_a);
+  layer_src_root->AddChild(layer_src_b);
+  layer_src_a->AddChild(layer_src_c);
+  layer_src_b->AddChild(layer_src_d);
+  layer_src_b->SetMaskLayer(layer_src_b_mask.get());
+  layer_src_b->SetReplicaLayer(layer_src_b_replica.get());
+
+  layer_src_a->SetNeedsPushProperties();
+  layer_src_b->SetNeedsPushProperties();
+  layer_src_b_mask->SetNeedsPushProperties();
+  layer_src_d->SetNeedsPushProperties();
+
+  // Only layers with descendants that require pushing properties will
+  // return true from ToLayerPropertiesProto.
+  proto::LayerUpdate layer_update_root;
+  EXPECT_TRUE(layer_src_root->ToLayerPropertiesProto(&layer_update_root));
+  proto::LayerUpdate layer_update_a;
+  EXPECT_FALSE(layer_src_a->ToLayerPropertiesProto(&layer_update_a));
+  proto::LayerUpdate layer_update_b;
+  EXPECT_TRUE(layer_src_b->ToLayerPropertiesProto(&layer_update_b));
+  proto::LayerUpdate layer_update_b_mask;
+  EXPECT_FALSE(layer_src_b_mask->ToLayerPropertiesProto(&layer_update_b_mask));
+  proto::LayerUpdate layer_update_b_replica;
+  EXPECT_FALSE(
+      layer_src_b_replica->ToLayerPropertiesProto(&layer_update_b_replica));
+  proto::LayerUpdate layer_update_c;
+  EXPECT_FALSE(layer_src_c->ToLayerPropertiesProto(&layer_update_c));
+  proto::LayerUpdate layer_update_d;
+  EXPECT_FALSE(layer_src_d->ToLayerPropertiesProto(&layer_update_d));
+
+  // All flags for pushing properties should have been cleared.
+  EXPECT_FALSE(layer_src_root->needs_push_properties());
+  EXPECT_FALSE(layer_src_root->descendant_needs_push_properties());
+  EXPECT_FALSE(layer_src_a->needs_push_properties());
+  EXPECT_FALSE(layer_src_a->descendant_needs_push_properties());
+  EXPECT_FALSE(layer_src_b->needs_push_properties());
+  EXPECT_FALSE(layer_src_b->descendant_needs_push_properties());
+  EXPECT_FALSE(layer_src_b_mask->needs_push_properties());
+  EXPECT_FALSE(layer_src_b_mask->descendant_needs_push_properties());
+  EXPECT_FALSE(layer_src_b_replica->needs_push_properties());
+  EXPECT_FALSE(layer_src_b_replica->descendant_needs_push_properties());
+  EXPECT_FALSE(layer_src_c->needs_push_properties());
+  EXPECT_FALSE(layer_src_c->descendant_needs_push_properties());
+  EXPECT_FALSE(layer_src_d->needs_push_properties());
+  EXPECT_FALSE(layer_src_d->descendant_needs_push_properties());
+
+  // Only 5 of the layers should have been serialized.
+  ASSERT_EQ(1, layer_update_root.layers_size());
+  EXPECT_EQ(layer_src_root->id(), layer_update_root.layers(0).id());
+  proto::LayerProperties dest_root = layer_update_root.layers(0);
+  ASSERT_EQ(1, layer_update_a.layers_size());
+  EXPECT_EQ(layer_src_a->id(), layer_update_a.layers(0).id());
+  proto::LayerProperties dest_a = layer_update_a.layers(0);
+  ASSERT_EQ(1, layer_update_b.layers_size());
+  EXPECT_EQ(layer_src_b->id(), layer_update_b.layers(0).id());
+  proto::LayerProperties dest_b = layer_update_b.layers(0);
+  ASSERT_EQ(1, layer_update_b_mask.layers_size());
+  EXPECT_EQ(layer_src_b_mask->id(), layer_update_b_mask.layers(0).id());
+  proto::LayerProperties dest_b_mask = layer_update_b_mask.layers(0);
+  EXPECT_EQ(0, layer_update_b_replica.layers_size());
+  EXPECT_EQ(0, layer_update_c.layers_size());
+  ASSERT_EQ(1, layer_update_d.layers_size());
+  EXPECT_EQ(layer_src_d->id(), layer_update_d.layers(0).id());
+  proto::LayerProperties dest_d = layer_update_d.layers(0);
+
+  // Ensure the properties and dependants metadata is correctly serialized.
+  EXPECT_FALSE(dest_root.needs_push_properties());
+  EXPECT_EQ(2, dest_root.num_dependents_need_push_properties());
+  EXPECT_FALSE(dest_root.has_base());
+
+  EXPECT_TRUE(dest_a.needs_push_properties());
+  EXPECT_EQ(0, dest_a.num_dependents_need_push_properties());
+  EXPECT_TRUE(dest_a.has_base());
+
+  EXPECT_TRUE(dest_b.needs_push_properties());
+  EXPECT_EQ(2, dest_b.num_dependents_need_push_properties());
+  EXPECT_TRUE(dest_b.has_base());
+
+  EXPECT_TRUE(dest_d.needs_push_properties());
+  EXPECT_EQ(0, dest_d.num_dependents_need_push_properties());
+  EXPECT_TRUE(dest_d.has_base());
+
+  EXPECT_TRUE(dest_b_mask.needs_push_properties());
+  EXPECT_EQ(0, dest_b_mask.num_dependents_need_push_properties());
+  EXPECT_TRUE(dest_b_mask.has_base());
+}
+
+TEST_F(LayerTest, SimplePropertiesDeserialization) {
+  scoped_refptr<Layer> layer = Layer::Create(LayerSettings());
+  proto::LayerProperties properties;
+  properties.set_id(layer->id());
+
+  properties.set_needs_push_properties(true);
+  properties.set_num_dependents_need_push_properties(2);
+  properties.mutable_base();
+  layer->FromLayerPropertiesProto(properties);
+  EXPECT_TRUE(layer->needs_push_properties());
+  EXPECT_TRUE(layer->descendant_needs_push_properties());
+
+  properties.set_needs_push_properties(false);
+  properties.mutable_base()->Clear();
+  layer->FromLayerPropertiesProto(properties);
+  EXPECT_FALSE(layer->needs_push_properties());
+  EXPECT_TRUE(layer->descendant_needs_push_properties());
+
+  properties.set_num_dependents_need_push_properties(0);
+  layer->FromLayerPropertiesProto(properties);
+  EXPECT_FALSE(layer->needs_push_properties());
+  EXPECT_FALSE(layer->descendant_needs_push_properties());
+
+  properties.set_needs_push_properties(true);
+  properties.mutable_base();
+  layer->FromLayerPropertiesProto(properties);
+  EXPECT_TRUE(layer->needs_push_properties());
+  EXPECT_FALSE(layer->descendant_needs_push_properties());
+}
+
 }  // namespace
 }  // namespace cc